number of pull requests not going down.

Hello,I'm working on a project with a colleague, and he is always lacking behind in pulls/ pushes, he just doesn't push or pull during the week. We are currently at a stage where I have pushed A LOT , and he is ~25 pulls behind me. He tries to pull all the changes, and merge the files that need merging - the number of pulls is not going down for him. he tried refreshing the repo, restarting his pc. Any advice?